重写GetHash code [英] Overriding GetHashCode

问题描述

如你所知，GetHash code返回一个半唯一值，可以用来识别一个集合对象实例。作为一个很好的做法，建议重写此方法并实现自己的。

As you know, GetHashCode returns a semi-unique value that can be used to identify an object instance in a collection. As a good practice, it is recommended to override this method and implement your own.

我的问题是 - 不要在自定义对象时覆盖此方法？如果是这样，你用哪种算法来生成唯一的ID？

My question is - do you override this method when working on custom objects? If so, what algorithm do you use to generate the unique ID?

我在想从识别器生成一个GUID，然后让整数数据。

I was thinking about generating a GUID and then getting integer data from that identificator.

推荐答案

如果您覆盖GetHash code（），您还需要重写的equals（），operator ==和operator！​​=。而且必须非常小心，以满足所有这些方法的要求。

If you override GetHashCode() you also need to override Equals(), operator== and operator != . And be very careful to meet all the requirements for those methods.

该准则这里MSDN 。最重要的是报价：

The guidelines are here on MSDN. Most important quote:

这不是一个好主意，覆盖运营商==非不变类型。

It is not a good idea to override operator == in non-immutable types.

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